1969 To 1972 Pontiac Grand Prix - A Grand History
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Though power ratings and compression ratios varied over the years, the 400 four-barrel engine was the standard powerplant in the Grand Prix Model J from 1969 to 1972. A 400 two-barrel was available as a no-cost option in 1969 and 1970. Sporty SJs received a 428 four-barrel in 1969 and then the larger 455 four-barrel from 1970 to 1972. The most powerful factory-rated engine available during these years was the 390hp 428 H.O. available in 1969 only. As an extra cost option on both the Model J and SJ, only 1,105 were installed that year. View Related Article
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